Why it works? because the bike are tuned for emisions... not for the best performance.... this little jewel increases the fuel just a little under throttle movement....smooothes it out!!!

I have one for my F800gs and it works fantastic!!!!

I have been working on this little wonder for 2 weeks every spare moment and have figured out how it works and how to build... I will begin the build process and sell them for half the price... and on this side the pond... It just a some what simple process of raising the resistance of the air box temp probe to trick the ECU to give it a little more gas.... I used the gs911 for testing.

The Accelerator module website states exactly how it works.... good reading!

Mileage and fuel consumption is going to be different for everyone, based on where they live. Altitude, relative humidity, temperature, etc. It all will make a difference. What I'd like to see is a comparison by two GS riders in the same area. One with and one without.

Personally, after replacing the cam chain tensioner on my 1150, and adjusting the valves, my surging problems are gone. Do wish the bike ran a little cooler... But it's a good excuse to lane split in traffic.

My bike was running well, or so I thought. The Accelerator arrived Monday and went in Tuesday. It took about 30 minutes to install.

After installation slow speed running is much smoother, and all throttle advance is accepted at any time with smoothness. There is no faltering or hesitation or vibration at any reasonable engine speed in any gear. A great way to spend a little money!

I've installed my 4th one now. 1st was on the 09 GSA, and my fuel mileage improved and low end acceleration improved as well. So I put one on the R12R and same thing. Bought one for a friend at XMas for his GSA, same result. Tonight I finally got around to installing the last one on the RT.

I'm obviously a fan of the accelerator module. Doesn't cost much for the improvements I've seen. I'm at 162' above sea level. All the bikes have remus full exhaust systems. Not sure all that matters, but just listed for reference.

I installed it on my 05 R12GS a while ago after a lot of people reported positive experience on the UKGSer forum.

For my riding pattern it is a significant improvement. I ride almost exclusively on small twisty roads through mountainous landscape. That means permanent changes in speed while often riding at not more than say 35 to 50 mph. Typical ambient temps are 40...75 degF.
I seldom use high rpm, rather enjoy the engines power at lower rev's (like 3...4000).

The accelerator module has greatly improved and smoothed the acceleration from low rpm. That gives much more comfort, confidence and fun e.g. with 2 up and driving uphill through a series of 180 deg swings.

I never cared to measure fuel mileage before and after precisely. But there was no big change, might be a very slight improvement.

Those BMW motors, be it boxer or inline four, are tuned lean for emission reasons. It sucks because you need a rich mixture, at least down low in the RPM range, to get that smooth torque. I am surprised that replacement chips are not offered instead of just add-on resistor harnesses. But he. It works ;-)

So far, I think that the two serious contenders are the BoosterPlug and the AcceleratorExtended (fit the probe in the airbox for accurate reading of the ambiant air, not just under the saddle where it's hotter - simply drill a hole and fit a rubber grommet to seal). The difference between both devices? Most likely only the price. $150.00cad for the BP shipped to Montreal vs $90.00cad for the AE. Let's also mention that Accelerator seems to over two different versions of the kit depending on if you run a catalyric convertor, or not.

From the BoosterPlug designer.

"All modern bike have an oxygen sensor in the exhaust to provide a feedback that will adjust mixture back to factory determined level. This actually works to your advantage as there's a certain delay in this feedback. This means that as long as you maintain a steady speed (steady throttle, steady RPM), the feedback from the O2 sensor will make the computer adjust the mixture back to the original lean level (good for mileage). This is called "Closed Loop" operation. As soon as you move to a different cell on the injection map by changing the throttle position or the RPMs, the oxygen sensor feed back cant keep up, and the bike will rely on the basic fuel map and input from temperature/air pressure sensors (like the first generation of fuel injection computers did). Now you will have the slightly richer mixture that is improving the drivability a lot. This is "Open Loop" operation."

I purchased the accelerator (the newer version with the sensor) last week and am anticipating Santa delivering it Wednesday.
Have a stock 2012 R1200gs. I ordered the "with catalytic converter" version (as promoted by the BMW dealer) is that correct?
Exactly where should I drill a hole in the air box for the probe?
Pictures would be helpful.
Will make a full report after installation and testing ;)

Quote:

Originally Posted by MassiveLee

Those BMW motors, be it boxer or inline four, are tuned lean for emission reasons. It sucks because you need a rich mixture, at least down low in the RPM range, to get that smooth torque. I am surprised that replacement chips are not offered instead of just add-on resistor harnesses. But he. It works ;-)

So far, I think that the two serious contenders are the BoosterPlug and the AcceleratorExtended (fit the probe in the airbox for accurate reading of the ambiant air, not just under the saddle where it's hotter - simply drill a hole and fit a rubber grommet to seal). The difference between both devices? Most likely only the price. $150.00cad for the BP shipped to Montreal vs $90.00cad for the AE. Let's also mention that Accelerator seems to over two different versions of the kit depending on if you run a catalyric convertor, or not.

From the BoosterPlug designer.

"All modern bike have an oxygen sensor in the exhaust to provide a feedback that will adjust mixture back to factory determined level. This actually works to your advantage as there's a certain delay in this feedback. This means that as long as you maintain a steady speed (steady throttle, steady RPM), the feedback from the O2 sensor will make the computer adjust the mixture back to the original lean level (good for mileage). This is called "Closed Loop" operation. As soon as you move to a different cell on the injection map by changing the throttle position or the RPMs, the oxygen sensor feed back cant keep up, and the bike will rely on the basic fuel map and input from temperature/air pressure sensors (like the first generation of fuel injection computers did). Now you will have the slightly richer mixture that is improving the drivability a lot. This is "Open Loop" operation."

Why it works? because the bike are tuned for emisions... not for the best performance.... this little jewel increases the fuel just a little under throttle movement....smooothes it out!!!

I have one for my F800gs and it works fantastic!!!!

I have been working on this little wonder for 2 weeks every spare moment and have figured out how it works and how to build... I will begin the build process and sell them for half the price... and on this side the pond... It just a some what simple process of raising the resistance of the air box temp probe to trick the ECU to give it a little more gas.... I used the gs911 for testing.

The Accelerator module website states exactly how it works.... good reading!

Don't mind me. Just saving for posterity. ;)

__________________RTB V- The Texas ADV Rally- Hurry before we fuck this up! http://www.rollthebonesrally.com/
"If you can't fix it with a hammer you can damn sure teach it a lesson".

I purchased the accelerator (the newer version with the sensor) last week and am anticipating Santa delivering it Wednesday.
Have a stock 2012 R1200gs. I ordered the "with catalytic converter" version (as promoted by the BMW dealer) is that correct?
Exactly where should I drill a hole in the air box for the probe?
Pictures would be helpful.
Will make a full report after installation and testing ;)

Any pix of where to drill the hole in the air box for the accelerator probe would be appreciated.

Quote:

Originally Posted by MoodyGS

I purchased the accelerator (the newer version with the sensor) last week and am anticipating Santa delivering it Wednesday.
Have a stock 2012 R1200gs. I ordered the "with catalytic converter" version (as promoted by the BMW dealer) is that correct?
Exactly where should I drill a hole in the air box for the probe?
Pictures would be helpful.
Will make a full report after installation and testing ;)